Notes
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AFTER UPDATE OF date_of_birth ON students
FOR EACH ROW
WHEN(NEW.date_of_birth IS NOT NULL)--condition
DECLARE
vd_today DATE;
BEGIN
SELECT SYSDATE
INTO vd_today
FROM students;
IF:NEW.date_of_birth<(vd_today-(365*18))
THEN
DBMS_OUTPUT.PUT_LINE('ERROR - BELOW 18 YEARS OF AGE!');
ELSE
DBMS_OUTPUT.PUT_LINE('ERROR - ABOVE OF YEARS OF AGE');
END IF;
END trig_date_constraint;
/
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